The premise of the Binh Duong Tax Department in Thu Dau Mot City, Binh Duong, is blocked for investigation following an explosion on September 30, 2019. Photo: B. Son / Tuoi Tre

A U.S.-based "terrorist organization" is responsible for a blast that occurred at the tax department of Binh Duong Province in southern Vietnam last month, according to information released by the Vietnamese Ministry of Public Security on Friday.

The explosion occured at the provincial tax department at 328 Binh Duong Boulevard in Thu Dau Mot City at around 9:00 am on September 30, 2019.

The blast caused a large wall to collapse and shattered the building's glass windows, but there were no human casualties.

Truong Duong, a 39-year-old man residing in Di An Town, Binh Duong, was latter arrested and named the main suspect behind the explosion.

He has been identified as a member of the so-called Provisional National Government of Vietnam, a U.S.-based group which has been labelled as a "terrorist organization" by the Vietnamese Ministry of Public Security, according to a post on the ministry's portal on Friday.

A screen grab captures information surrounding an explosion at the Binh Duong Tax Department released via the portal of the Ministry of Public Security on October 25, 2019.

Duong caused the explosion on the order of Lisa Pham, a member of the organization who is living in the U.S, the post reads.

The investigative security agency of Binh Duong Police launched legal proceedings against Duong for “terrorism against the people’s government” on October 10 pursuant to Vietnam’s Penal Code, it said.

Investigation into the case is still under way, the announcement reads.

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